import turtle
ablak = turtle.Screen()
teki = turtle.Turtle()
teki.speed(0)
szin = ["red", "blue", "yellow", "green", "black", "purple", "orange", "cyan", "grey", "pink"]
oldal = 10*20
for i in szin:
    teki.color(i, i)
    teki.begin_fill()
    for j in range(4):
        teki.forward(oldal)
        teki.left(90)
    teki.end_fill()
    oldal = oldal - 20
    teki.left(10)
ablak.mainloop()